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5 SNVU504A – August 2016 – Revised August 2016
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LM5161 Buck EVM User’s Guide
User's Guide
SNVU504A – August 2016 – Revised August 2016
LM5161 Buck EVM User’s Guide
1 Introduction
The LM5161 evaluation module (EVM) is designed to showcase the performance of the LM5161
synchronous buck DC/DC buck converter. The purpose of the user's guide is to highlight the
specifications, setup instructions, complete application schematic, bill of materials (BOM), and typical
performance curves of the EVM. The LM5161 is supported by WEBENCH
®
Designer and unencrypted
PSpice simulation models. Furthermore, the reader can use the LM5161 Quick-start calculator to optimize
component selection and examine estimated efficiency performance across wide line and load ranges.
The LM5161 device name is used generically throughout this document and represents both the LM5161
and the LM5161-Q1, unless stated otherwise.
2 EVM Description and Performance Specifications
The LM5161 Buck evaluation board provides a fully functional buck regulator, employing the constant ON-
time (COT) control scheme. This provides a 12 V output over an input voltage range of 15 V to 80 V with
output current rated up to 1 A. The application schematic of the EVM has been set up to operate from a
nominal 48-V input supply. The switching frequency is set to approximately 300 kHz. The board is
designed to demonstrate a synchronous buck with small solution size for 12 W wide V
IN
applications.
Table 1. LM5161 Buck EVM Specifications
ORDERABLE NAME V
IN
V
OUT
I
OUT
EFFICIENCY
LM5161PWPBKEVM 15 V–80 V 12 V 0 A –1 A 94%
3 Test Setup and Operation
This section describes the connectors, the test points and the jumpers in the EVM.
3.1 Recommended Test Setup
3.1.1 Input/Output Connector Description
J1 – Input is the power input terminal for the converter. The terminal block provides an input V
IN
(+) and
ground (-) connection to allow the user to attach the EVM to a power supply.
J2 – Output is the regulated output voltage terminal for the converter. The terminal block provides a V
OUT
(+) and ground (-) connection to allow the user to attach the EVM to a load.
J3 – (EN) allows the user to remotely shutdown/startup LM5161.
J4 – (V
OUT
to V
CC
connection) allows the user to check for the operation with and without the external V
CC
connection (V
CC
pin diode connected to V
OUT
)
JP1 – MODE pin allows the user to select between forced CCM (FPWM = 1) and DCM (FPWM = 0)
operation. See Section 3.2 and Table 2 for more details.